Forms the dot product using long-double accumulation to mitigate rounding error.
Usage
dqddot(N = NULL, X, INCX = 1L, Y, INCY = 1L)
Arguments
- N
Optional integer giving the number of elements. Defaults to `length(X)`.
- X
Double-precision vector, matrix or [`bigmemory::big.matrix`] input.
- INCX
Integer stride for traversing `X`.
- Y
Double-precision object updated in place.
- INCY
Integer stride for traversing `Y`.
Value
Numeric scalar equal to the dot product of `X` and `Y`.
Examples
dqddot(X = 1:3, Y = c(2, 4, 6))
#> [1] 28
